Hello, This is my first message to this mailing list, so please be gentle!
During the summer and autumn I built my first ever kit: the K1-2 (#3449) + KAT1. Everything worked surprisingly well (being a first-timer and all), I never had any problems. Until now. It seems that I failed in my “build-without-help” venture :) A few days ago I completed building the KNB1 option and when I got to the “Initial Test” phase I noticed that in the menu, instead of HI/LO/OFF I can only see three dashes (---). The instructions say that the K1 firmware has not detected the noise blanker module and that a possible cause may be that the U3 was soldered in backwards. I assume that’s a mistake - there is no U3. Just a U1, and it’s soldered properly. Some details: - The K1 firmware is revision 109 - The KNB1 PCB is revision Cr - U1 on KNB1 has a small paper label with “NB 1.02” written on it - Turning the trimmer C2 on KNB1 does vary the band noise and received signal strength - There is continuity from KNB1 U1 pins 3/4 to the front panel U1 pin 8 (6R/AUX) - around 182 ohms - The voltage between KNB1 U1 pin 1 (VDD) and GND is 6.03V - The voltage between KNB1 U1 pin 5 and GND is 5.59V (this is the 6V switch for the noise blanker) That’s about as much information as I can think of right now. Has anyone else encountered the same issue before? At the moment I’m thinking that KNB1 U1 may be defective, but I don’t know how to make sure. I would appreciate some assistance in solving this. Many thanks for taking the time to read this message! 73, Bogdan YO8SAW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
